Alexander Georg von Bunge (Russian: Aleksandr Andreevich von Bunge, Алекса́ндр Андре́евич Бу́нге; 6 October [O.S. 6 July] 1890) was a Russian German botanist. He is best remembered for scientific expeditions into Asia and especially Siberia. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Mars large craters are named after deceased scientists, writers and others who have contributed to the lore of Mars. Small creaters (less than 60km) are named after small towns and villages.